Oscar, a 4-month-old baby, is a participant of a preferential-looking experiment. Researchers show Oscar two photographs: a photo of his mother and a photo of a female stranger. The photographs are presented repeatedly in differing locations, and the amount of time Oscar spends looking at the photographs is recorded. What will researchers conclude if Oscar shows a reliable preference for the photograph of his mother over that of the stranger?
A. Oscar is afraid of strangers.
B. Oscar likes strangers as much as his mother.
C. Oscar can't see very well.
D. Oscar can discriminate the photograph of his mother from that of the stranger.
Answer: D
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